Intercellular Adhesion Molecule-5 Induces Dendritic Outgrowth by Homophilic Adhesion

نویسندگان

  • Li Tian
  • Henrietta Nyman
  • Patrick Kilgannon
  • Yoshihiro Yoshihara
  • Kensaku Mori
  • Leif C. Andersson
  • Sami Kaukinen
  • Heikki Rauvala
  • W. Michael Gallatin
  • Carl G. Gahmberg
چکیده

Intercellular adhesion molecule-5 (ICAM-5) is a dendritically polarized membrane glycoprotein in telencephalic neurons, which shows heterophilic binding to leukocyte beta(2)-integrins. Here, we show that the human ICAM-5 protein interacts in a homophilic manner through the binding of the immunoglobulin domain 1 to domains 4-5. Surface coated ICAM-5-Fc promoted dendritic outgrowth and arborization of ICAM- 5-expressing hippocampal neurons. During dendritogenesis in developing rat brain, ICAM-5 was in monomer form, whereas in mature neurons it migrated as a high molecular weight complex. The findings indicate that its homophilic binding activity was regulated by nonmonomer/monomer transition. Thus, ICAM-5 displays two types of adhesion activity, homophilic binding between neurons and heterophilic binding between neurons and leukocytes.

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عنوان ژورنال:
  • The Journal of Cell Biology

دوره 150  شماره 

صفحات  -

تاریخ انتشار 2000